Nikon D300 User Manual (en)

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f5: Assign Preview Button
Choose the role played by the depth-of-field 
preview button, either by itself ([Preview 
button press]) or when used in combination 
with the command dials ([Preview + 
command dials]). The options available are 
the same as for [FUNC. button press] 
(pg. 302) and [FUNC. button+dials] (pg. 304), 
except that the default option for [Preview button press] is 
[Preview] and the default setting for [Preview + command dials] is 
[None].